The Latest: Ukraine comedian romping to presidential win

With just over half of Ukraine's polling stations reporting, a comedian whose only political experience consists of playing a president on TV is cruising toward a landslide victory in Sunday's presidential election.

Sitcom star Volodymyr Zelenskiy has 73% of the votes reported so far, while President Petro Poroshenko is far behind at about 25%.

It is a crushing rebuke to Poroshenko's five years in office and the results are seen as a reaction against Ukraine's entrenched corruption and low standard of living.

Zelenskiy is promising wide changes in the top echelons of government. Ukraine has been plagued by rampant graft, a sickly economy and a grinding, five-year war with Russian-backed separatists in the eastern part of the country that has killed over 13,000 people.

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10:15 p.m.

Volodymyr Zelenskiy says his first job as Ukraine's new president is to secure the release of military prisoners held in separatist eastern Ukraine and in Russia.

Zelenskiy set the goal as results from an exit poll and very early election returns showed him winning a landslide victory over the incumbent, President Petro Poroshenko.

He told reporters on Sunday: "Task number one for us is the return of all prisoners, all war hostages, our sailors,"

Two dozen Ukrainian sailors have been held in Russia since November, when the Russian coast guard captured three Ukrainian naval vessels as they passed through the Kerch Strait between mainland Russia and Russia-annexed Crimea.

Russia seized Crimea in 2014 in a move that Ukraine and almost all of the world views as illegal. Fighting broke out in eastern Ukraine that same year, and 144 prisoners are believed to be held separatist rebels.

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9:05 p.m.

Ukrainian comedian Volodymyr Zelenskiy is promising his country's people he won't disappoint them.

Zelenskiy said after a poll of voters in a runoff election Sunday suggested his overwhelming victory that his apparent win could be a model for other ex-Soviet states that want to move beyond ossified politics.

He said: "While I am not yet president, I can speak as a citizen of Ukraine: To all the countries of the former Soviet Union, look at us. Everything is possible."

The poll conducted by the Kiev International Institute of Sociology and the Razumkov Center public opinion organization was based on more than 13,000 responses to face-to-face questions at 300 polling places as of 6 p.m., two hours before the polls closed.

The poll claims a margin of error of 3 percentage points.

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1:35 p.m.

Ukraine's president, taking a jab at his comedian challenger, says that laugh could give way to pain for the nation if his rival wins the presidential runoff.

Opinion polls ahead of Sunday's runoff showed President Petro Poroshenko trailing behind comic actor Volodymyr Zelenskiy, who is famous for playing the nation's president in a popular TV sitcom.

Speaking after casting his ballot, Poroshenko said "it's important to be guided by reason, not laughs," adding that "it could be funny first, but pain may come later."

He emphasized the need to "defend achievements over the past five years," noting the creation of Ukraine's own independent Orthodox church, which he championed.

Zelenskiy got twice as many votes as Poroshenko in the first round three weeks ago, reflecting public anger at endemic corruption, a moribund economy and a five-year wat against Russia-backed insurgents in the east.

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12:30 p.m.

A comedian who has a strong chance to win Ukraine's presidential vote says his campaign already has helped unite the country.

Volodymyr Zelenskiy, 41, who comes from Ukraine's mostly Russian-speaking east, got twice as many votes as President Petro Poroshenko in the first round of voting three weeks ago. Opinion polls have shown him far ahead of the incumbent ahead of Sunday's runoff, reflecting public disenchantment with Ukraine's pervasive corruption and its political elite.

Speaking after casting his ballot in the Ukrainian capital, Zelenskiy predicted that Sunday's vote will mark a "victory for the Ukrainian people." He added that "we have united the country."

Like Poroshenko, Zelenskiy has promised to keep Ukraine on a pro-Western course, but says the country needs to hold a nationwide referendum on whether to join NATO.

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10:10 a.m.

Corruption and economic stagnation are big issues for voters in Ukraine's presidential runoff.

Lyudmila Potrebko, a 22-year-old computer programmer, cast her ballot for Volodymyr Zelenskiy, a 41-year-old comedian who is challenging President Petro Poroshenko.

She says "I have grown up under the old politicians and only have seen empty promises, lies and corruption ... It's time to change that."

Zelenskiy, 41, got twice as many votes as Poroshenko in the first round three weeks ago. Like his sitcom character, a teacher thrust into the presidency after a video of him blasting corruption goes viral, he has focused on fighting graft, riding the wave of public distrust of Ukraine's political elite.

Many voters in this nation of 42 million are struggling to survive on meager wages and soaring utility bills.

Irina Fakhova, a 55-year-old sales clerk, says "we have grown poor under Poroshenko and have to save to buy food and clothing ... we have had enough of them getting mired in corruption and filling their pockets and treating us as fools."

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8 a.m.

Polls have opened in Ukraine's presidential runoff as the nation's incumbent leader struggles to fend off a strong challenge by a comedian who denounces corruption and plays the role of president in a TV sitcom.

Zelenskiy, 41, got twice as many votes as Poroshenko in the first round three weeks ago. Like his sitcom character, a teacher thrust into the presidency after a video of him blasting corruption goes viral, he has focused on fighting graft, riding the wave of public distrust of Ukraine's political elite.

Poroshenko, a billionaire candy magnate before taking office, has relied on traditional political barnstorming, using sympathetic television stations to extensively cover his appearances. Zelenskiy, however, has largely stayed away from the campaign trail and eschewed interviews. He has run his campaign mainly on Instagram, where he has 3.7 million followers.